Fix the format of the output result of mavgen_cs.py

[wshon]

I'm sorry my English sucks

When description in param is defined within entry is multi-line, summary is malformed.

https://github.com/mavlink/mavlink/blob/b0a16eb7b09112d48bceb8a216fb3ad7693895e5/message_definitions/v1.0/development.xml#L169

It will look like this, there has been an error in the syntax.

        ///<summary> Fly a figure eight path as defined by the parameters.           Set parameters to NaN/INT32_MAX (as appropriate) to use system-default values.           The command is intended for fixed wing vehicles (and VTOL hybrids flying in fixed-wing mode), allowing POI tracking for gimbals that don't support infinite rotation.           This command only defines the flight path. Speed should be set independently (use e.g. MAV_CMD_DO_CHANGE_SPEED).           Yaw and other degrees of freedom are not specified, and will be flight-stack specific (on vehicles where they can be controlled independent of the heading).          |Major axis radius of the figure eight. Positive: orbit the north circle clockwise. Negative: orbit the north circle counter-clockwise.
        NaN: The radius will be set to 2.5 times the minor radius and direction is clockwise.
        Must be greater or equal to two times the minor radius for feasible values.| Minor axis radius of the figure eight. Defines the radius of the two circles that make up the figure. Negative value has no effect.
        NaN: The radius will be set to the default loiter radius.| Reserved (default:NaN)| Orientation of the figure eight major axis with respect to true north (range: [-pi,pi]). NaN: use default orientation aligned to true north.| Center point latitude/X coordinate according to MAV_FRAME. If no MAV_FRAME specified, MAV_FRAME_GLOBAL is assumed.
        INT32_MAX or NaN: Use current vehicle position, or current center if already loitering.| Center point longitude/Y coordinate according to MAV_FRAME. If no MAV_FRAME specified, MAV_FRAME_GLOBAL is assumed.
        INT32_MAX or NaN: Use current vehicle position, or current center if already loitering.| Center point altitude MSL/Z coordinate according to MAV_FRAME. If no MAV_FRAME specified, MAV_FRAME_GLOBAL is assumed.
        INT32_MAX or NaN: Use current vehicle altitude.|  </summary>
        [Description("Fly a figure eight path as defined by the parameters.           Set parameters to NaN/INT32_MAX (as appropriate) to use system-default values.           The command is intended for fixed wing vehicles (and VTOL hybrids flying in fixed-wing mode), allowing POI tracking for gimbals that don't support infinite rotation.           This command only defines the flight path. Speed should be set independently (use e.g. MAV_CMD_DO_CHANGE_SPEED).           Yaw and other degrees of freedom are not specified, and will be flight-stack specific (on vehicles where they can be controlled independent of the heading).         ")]
        DO_FIGURE_EIGHT=35, 

So I did a cleanup of the description in param, then it turns out like this, and the syntax error has been fixed.

        ///<summary> Fly a figure eight path as defined by the parameters.           Set parameters to NaN/INT32_MAX (as appropriate) to use system-default values.           The command is intended for fixed wing vehicles (and VTOL hybrids flying in fixed-wing mode), allowing POI tracking for gimbals that don't support infinite rotation.           This command only defines the flight path. Speed should be set independently (use e.g. MAV_CMD_DO_CHANGE_SPEED).           Yaw and other degrees of freedom are not specified, and will be flight-stack specific (on vehicles where they can be controlled independent of the heading).          |Major axis radius of the figure eight. Positive: orbit the north circle clockwise. Negative: orbit the north circle counter-clockwise.         NaN: The radius will be set to 2.5 times the minor radius and direction is clockwise.         Must be greater or equal to two times the minor radius for feasible values.| Minor axis radius of the figure eight. Defines the radius of the two circles that make up the figure. Negative value has no effect.         NaN: The radius will be set to the default loiter radius.| Reserved (default:NaN)| Orientation of the figure eight major axis with respect to true north (range: [-pi,pi]). NaN: use default orientation aligned to true north.| Center point latitude/X coordinate according to MAV_FRAME. If no MAV_FRAME specified, MAV_FRAME_GLOBAL is assumed.         INT32_MAX or NaN: Use current vehicle position, or current center if already loitering.| Center point longitude/Y coordinate according to MAV_FRAME. If no MAV_FRAME specified, MAV_FRAME_GLOBAL is assumed.         INT32_MAX or NaN: Use current vehicle position, or current center if already loitering.| Center point altitude MSL/Z coordinate according to MAV_FRAME. If no MAV_FRAME specified, MAV_FRAME_GLOBAL is assumed.         INT32_MAX or NaN: Use current vehicle altitude.|  </summary>
        [Description("Fly a figure eight path as defined by the parameters.           Set parameters to NaN/INT32_MAX (as appropriate) to use system-default values.           The command is intended for fixed wing vehicles (and VTOL hybrids flying in fixed-wing mode), allowing POI tracking for gimbals that don't support infinite rotation.           This command only defines the flight path. Speed should be set independently (use e.g. MAV_CMD_DO_CHANGE_SPEED).           Yaw and other degrees of freedom are not specified, and will be flight-stack specific (on vehicles where they can be controlled independent of the heading).         ")]
        DO_FIGURE_EIGHT=35, 

[peterbarker]

Merged, thanks!